Home | About me | Contact | What's new | Privacy | Search

San Antonio
Freeway system
  Fwy system history
  2021 traffic statistics
  The freeways
    I-10 East
    I-10 West
    I-35 North
    I-35 South
    Kelly Pkwy
    Loop 410 (I-410)
    Loop 1604
    SH 151
    Spur 371
    US 90 West
    US 281 North
    Wurzbach Pkwy
  Construction projects
    I-10E Exp (Graytown)
    I-10E/Loop 410
    I-10 Boerne area
    I-35 Comal Projects
    I-35 NEX
    Loop 410/SH 151
    Loop 410/US 281
    LP 1604N Expansion
    LP 1604/Blanco
    LP 1604/FM 78-I-10
    LP 1604/I-35-FM 78
    SH 151 Expansion
    US 90W Expansion
    US 90/Loop 410
    US 281N Expansion
    US 281 Comal Exp
    US 281/Basse
    US 281/Jones-Mltsbrg
    Wurzbach/NW Military
    HOV lanes
    Media galleries
    Tollway system
    10/1604 yield signs
    History of 281/410
Other roads

Search this site
This site is not affiliated with any official agency.

Buy Me a Coffee at ko-fi.com

If you found this site informative, please consider making a small donation to help support it. Thanks!


I-10 San Antonio Area Freeway System
Interstate 10 West (Robert F. McDermott Freeway)

This page last updated February 12, 2023

I-10 West highlight map This page covers Interstate 10 northwest of downtown San Antonio from I-35 to Ralph Fair Rd. Two miles of I-10 is concurrent (multiplexed) with I-35 south of this segment; see the I-35 South page for details. Interstate 10 continues east of downtown; see the I-10 East page for more info.

Length: 16 miles


On this page

Lanes Access
Special features
& notes


This segment of I-10 serves the northwest corridor, one of the fastest growing areas of the city. A tremendous amount of the region's suburban office space is located in this corridor as are the headquarters for several large companies. The corridor also serves the bustling and continually-growing South Texas Medical Center district; Wonderland of the Americas mall (formerly known as Crossroads mall); the University of Texas at San Antonio's (UTSA) main and downtown campuses; Six Flags Fiesta Texas; Joint Base San Antonio Camp Bullis and Camp Stanley; and The Rim, La Cantera, Landmark, Colonnade, Huebner Oaks, and Fiesta Trails retail centers and mixed-use developments. One suburban city, Balcones Heights, also lies within the corridor as does the unincorporated Leon Springs area. I-10 continues northward to the booming outlying areas of Fair Oaks Ranch, Boerne, and Kendall County. Inside Loop 410, the route is lined with light industrial and residential areas. Heavy commercial development dominates the landscape between Loop 410 and La Cantera Blvd., with moderate and growing commercial and residential development north of there all the way to Boerne.

While it is signed as east/west, this segment actually runs mostly north/south. To avoid confusion, many locals give directions as "inbound" or "outbound" (from downtown) instead; I use that convention here.

Roadway details

  • 10 lanes double-decked (6 lanes on the upper levels; 4 lanes on the lower level) from I-35/Frio St. to Fulton Ave.
  • 10 lanes from Fulton Ave. to Loop 410 with a short 8 lane section through the Loop 410 interchange.
  • 11 lanes (5 inbound, 6 outbound) from Loop 410 to Wurzbach Rd.
  • 8 lanes from Wurzbach Rd. to Huebner Rd.
  • 9 lanes (5 inbound, 4 outbound) from Huebner Rd. to Loop 1604.
  • 6 lanes from Loop 1604 to Ralph Fair Rd.

  • 2 HOV lanes (one each direction) from La Cantera Blvd. to Ralph Fair Rd.

I-10 lanes map

  • Continuous access roads from I-35 to Frio St.
  • No continuous access roads from Frio St. to Woodlawn Ave., except on the inbound side between Woodlawn Ave. and Culebra Ave.
  • Continuous access roads along remainder of route north of Woodlawn Ave.
  • Westbound access road splits in Leon Springs. The west leg continues along the freeway and ends at Boerne Stage Rd. The east leg passes through Leon Springs and then continues northward to Ralph Fair Rd.
  • Access road intersection bypass at Medical Dr. (both directions).

I-10 access roads map


Click here for a list of I-10 West exits.
  • 60 mph from I-35 to Fulton St.
  • 65 mph from Fulton to La Cantera Blvd.
  • 70 mph from La Cantera Blvd. to Ralph Fair Rd.

I-10 speed limit map

  • US 87 concurrent (multiplexed) along entire route.
  • Double-decked from Frio St. to Hildebrand Ave.
  • TransGuide coverage from I-35 to Camp Bullis Rd.
  • VIA Metropolitan Transit Park & Ride locations:
    • Crossroads: Crossroads Blvd.
    • University: Loop 1604 (under interchange)
  • Left exit to I-35 northbound.
  • Special double-height bridge rail barrier on ramp to I-35 northbound.
  • Unusual yield sign arrangement at Loop 1604 interchange; click here for more information.
  • Two waterways run longitudinally below the freeway:
    • Martinez Creek between West Ave and Fresno Ave.
    • San Pedro Creek between Frio St. and I-35

I-10 special features map

Heavy to extremely heavy along entire route.

Regular morning and afternoon peak-period congestion occurs on the approaches to Loop 410 and I-35. 


Traffic volume legend

I-10 traffic map

LOCATION 2001 2011 2016 2019 2020 2021 '11-'21
W of Frio St.159,000161,000186,834187,306159,210178,837+11.08%
S of Crossroads Blvd.157,000173,000205,174206,072176,291219,228+26.72%
N of Callaghan Rd.171,000200,000240,483241,130211,683237,094+18.55%
N of Huebner Rd.138,000172,000182,092182,384156,823183,673+6.79%
N of DeZavala Rd.163,000207,000184,375199,029172,205202,353-2.24%
N of UTSA Blvd.112,000156,000153,716156,092135,523183,419+17.58%
N of Loop 1604W69,000106,000116,529121,393103,442150,152+41.65%
N of Dominion Dr.58,00074,00087,50798,29989,018131,740+78.03%
N of FM 335142,00052,00064,04980,74569,07381,446+56.63%

Media gallery

Click here for photos and video of this freeway.

Construction projects

  • La Cantera Blvd. to Ralph Fair Rd.: Widen freeway to six general purpose lanes plus two HOV lanes. Click here for details on this project.

Click here to view information for all projects in this corridor.

Future plans

TxDOT plans to add one general purpose lane and one HOV lane in each direction from Ralph Fair Rd. to Boerne. There is currently no funding or timeline for that expansion

A fully-directional "stack" interchange was proposed at Loop 1604 as part of the Loop 1604 managed lanes project. It will now be built as part of the Loop 1604 North expansion project.


The section from Fredericksburg Rd. at Woodlawn Ave. to Culebra Ave. was San Antonio's first expressway.

Most of the route from just north of Huebner Rd. to Leon Springs was part of the original route of US 87 and its predecessors US 290, US 385, SH 9, and SH 27. The short section of Old Fredericksburg Rd. at Loop 1604 was bypassed by the current route in 1934 as part of the Arneson Plan to improve state highways in Bexar County. The section of I-10 today north of Leon Springs was also built in 1934 as part of the Arneson Plan; prior to that, the route followed Boerne Stage Rd.

The first freeway sections to be built were simply called "US 87 Expressway". It was briefly called the "North Expressway" before being named the "Northwest Expressway" when planning began for the US 281 "North Expressway". The designation as I-10 was authorized on October 1, 1959. The route was renamed as "McDermott Freeway" ca. 1995 for Robert F. McDermott, the former CEO of the USAA financial services corporation whose headquarters are located adjacent to the freeway south of Huebner Rd. 

  • Late 1930s: The section from Woodlawn Ave. to downtown was included as part of the original three-legged expressway plan for San Antonio designed to provide bypass routes around downtown for through traffic on the various US and state highways. The United States' entrance into World War II delayed these plans until after the war.
  • July 8, 1949: The section from Fredericksburg Rd. at Woodlawn Ave. to Culebra Ave. opened without fanfare. This was the first expressway in San Antonio and appears to be the second in Texas, coming less than a year after the Gulf Freeway opened in Houston and a month before the opening of Central Expressway in Dallas.
  • November 28, 1949: The section from Culebra Ave. to Frio St. opened with the official ribbon-cutting for the entire Woodlawn Ave. to Frio St. section.
  • November 1950: The segment from Frio St. to Martin St. was completed.
  • June 1955: Alignment finalized for the routing of the section from Woodlawn Ave. to De Zavala Rd. A previous proposal in 1953 had I-10 further east crossing Loop 410 at Vance-Jackson Rd., and a plan from around 1951 showed it paralleling Fredericksburg Rd. roughly 2/3rd of a mile to the east. 
  • 1957: "Downtown Y" interchange completed. 
  • April 1960: The section from Loop 410 to Fredericksburg Rd. north of Huebner Rd. was completed including the interchange at Loop 410.
  • October 1960: The segment from Woodlawn Ave. to Fresno Dr. opened.
  • November 1961: The section from Fresno Dr. to Loop 410 was completed.
  • 1966: The section from Dominion Dr. to Boerne opened.
  • 1967: The ramps connecting I-35 North to and from I-10 West in the "Downtown Y" interchange were completed. Prior to this, there were only direct connections between I-35 South and I-10 West. Traffic headed to and from I-35 North had to exit and use the access roads
  • 1968: The existing segment of US 81 from Fredericksburg Rd. near Huebner to Dominion Dr. was upgraded to a freeway.
  • 1982: First phase of Loop 1604 interchange completed.
  • 1983-1994: Reconstruction and double-decking from I-35 to Hildebrand Ave.
  • 1987: Loop 1604 interchange completed.
  • 1991: The segment from Loop 1604 to Camp Bullis Rd. widened from four to six lanes.
  • 1992: The music group REM filmed the video for their song "Everybody Hurts" on the lower level at Woodlawn Ave. Producers had originally wanted to use US 281 North at Loop 1604, but decided it looked too wide in camera shots.
  • 1993: The section from Loop 1604 south to Fredericksburg Rd. (near Huebner) widened from four to six lanes.
  • 1995: TransGuide coverage added to the section south of Hildebrand Ave. as part of the original TransGuide project.
  • 1996: The segment from Fredericksburg Rd. south to Wurzbach Rd. was expanded from four to eight lanes.
  • 1998: The section from Wurzbach Rd. to Callaghan Rd. was widened from four to eight and 10 lanes.
  • 1999: TransGuide coverage added from Hildebrand Ave. to Camp Bullis Rd.
  • 2000-2009: Loop 410 interchange reconstructed.
  • 2008: The section from Crossroads Blvd. to Fulton Ave. was widened from six to 10 lanes.
  • 2009: Dominion Dr. overpass completed and access roads between Camp Bullis Rd. and Dominion Dr. converted to one-way.
  • 2011: Reconstruction from Camp Bullis Rd. to Dominion Dr. to raise and lengthen the Camp Bullis overpass and improve drainage was completed.
  • 2016: The section from Ramsgate Dr. to Loop 1604 was widened from six to eight lanes.
  • 2017: Conversion of access roads to one-way and other improvements from Dominion Dr. to Leon Springs completed.
  • 2020: The section from La Cantera Blvd. to Ralph Fair Rd. widened to six lanes plus two HOV lanes.

I-10 at Woodlawn Ave. looking north in 1949
The freeway ended here and curved up to Fredericksburg Rd.
(Photo courtesy of TxDOT)

I-10 at Frio St. looking southeast in 1950
(Photo courtesy of TxDOT)

Snippet of 1953 plan for routing of US 87 (I-10) in the vicinity Loop 13 (Loop 410)
Note the location of the planned US 87/Loop 13 interchange between Vance-Jackson Rd. and Jackson-Keller Rd.
(Document courtesy of TxDOT)

This page and all its contents are Copyright 2023 by Brian Purcell

The information provided on this website is provided on an "as-is" basis without warranties of any kind either express or implied.  The author and his agents make no warranties or representations of any kind concerning any information contained in this website.  This website is provided only as general information.  The author expressly disclaims all liability with respect to actions taken or not taken based upon the information contained herein or with respect to any errors or omissions in such information.  All opinions expressed are strictly those of the author.  This site is not affiliated in any way with any official agency.